Delete saved games
Hold [L] + [R] and turn on the Game Boy Advance. Select "Yes" at the prompt to delete your game saves.

Obtain ranking password
Select "Ranking" at the main menu. Select the desired series, game, and course. Then, hold [L] and press [Up], [Right]x2, [B], [Left], [B], [Right], [A] at the course ranking screen. The course name at the top of the screen will be replaced with a password to confirm correct code entry. This password is used by Nintendo to confirm your course rank in their contests.

Silver Thunder
Win the Queen tracks under the expert difficulty setting. Alternately, win any set of tracks under the master difficulty setting.

Jet Vermilion
Go to www.nintendo.co.jp site and enter your name exactly, and press "Confirm". You should get a password which will allow you to get the top secret car Jet Vermilion. Enter that password in your game to unlock the car.

At the name entry screen, select "Entry". Then enter "T&T" as a name. Start a game under that name. When you reach the machine selection screen in Grand Prix mode, enable the "Password screen" code and enter "V-J4+6V9A-30" as a password.

At the name entry screen, select "Entry". Then enter "YAZZO JR." as a name (including the space). Start a game under that name. When you reach the machine selection screen in Grand Prix mode, enable the "Password screen" code and enter "2-8+o8T2YQ30" as a password.

Alternately, enter "H-M2XLT8A-30" or "3-KLY9V8?-30" as a password. Then, press [Up] at the vehicle selection screen.

You can unlock Jet Vermilion normally by using one of two methods. One is to unlock all other cars and completing championship mode 255 times. The other to complete every series on Master Class with all other racers.

Master difficulty setting
Win the Pawn, Knight, or Bishop series under expert difficulty level in grand prix mode to unlock the master difficulty for that series.

Bishop Series: Cloud Carpet: Icarus Circuit: Shortcut
When you get off the bank of ice/snow, use a boost from the previous lap and go straight. You will save time and avoid damage to your car on that sharp turn.

Knight Series: Ancient Mesa: Split Circuit: Shortcut
Once you reach the second bank of ice/snow before the jump, use the boost you have gained on the previous lap and make the sharpest left you can. You will land on the other side of the track before the finish line. This saves time and avoids crashes on that sharp turn.

Queen Series: Tenth Zone East: Plummet Circuit: Shortcut
Before you get to the fork jump, use a boost from the previous lap. Do not immediately go over the sparkly ground. Instead, stay slightly to the side of the sparkly ground to go farther than usual.

Make sure you have a boost. Use the boost before the first jump. On the second jump, make a sharp left. If you land on the road and have enough boost, you can make a sharp right and land on the S-curve road.

Turn sharply
Press [A] repeatedly while turning to turn without hitting the forcefield.